Automatic load detection device for charging pile of two-wheeled vehicle

Abstract

The utility model relates to the technical field of charging piles, in particular to an automatic load detection device for a charging pile of a two-wheeled vehicle, which comprises a power supply conversion module, an MCU (Microprogrammed Control Unit) control module, a relay control module, a load detection module and an LED (Light Emitting Diode) lamp indication module, and is characterized in that the power supply conversion module is electrically connected with the MCU control module, the relay control module and the load detection module respectively; the MCU control module is electrically connected with the relay control module, the load detection module and the LED lamp indication module, the power supply conversion module comprises a first voltage reduction module, an AC-DC power supply module and a second voltage reduction module, the load detection module comprises a sampling resistor RL, an electric energy metering chip U1 and a resistance voltage division circuit, the sampling resistor is electrically connected with the electric energy metering chip U1, and the resistance voltage division circuit is electrically connected with the AC-DC power supply module. The resistance voltage division circuit is electrically connected with the electric energy metering chip U1, and the electric energy metering chip U1 is electrically connected with the MCU control module through a UART. According to the utility model, the physical connection condition of the charging port can be monitored in real time, a user does not need to select the charging port, and the charging process can be visually known.

Description

Technical Field

[0001] This utility model relates to the field of charging pile technology, specifically to an automatic load detection device for two-wheeled vehicle charging piles. Background Technology

[0002] In the current two-wheeled charging pile technology field, a typical setup consists of one QR code and two power ports on a single device. This presents several inconveniences in practical applications: First, after scanning the code, users still need to manually select the desired charging port to begin charging, undoubtedly increasing the complexity of the process. Second, the charging pile lacks indicator lights to display the current power port status, meaning users cannot directly determine if the port is functioning correctly; they can only find out after scanning the code. These current conditions and problems negatively impact the user's charging experience and ease of use, posing both a need and a challenge for the further optimization and improvement of two-wheeled charging piles. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned technical problems and propose an automatic load detection device for two-wheeled vehicle charging piles.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An automatic load detection device for a two-wheeled vehicle charging pile includes a power conversion module, an MCU control module, a relay control module, a load detection module, and an LED indicator module. The power conversion module is electrically connected to the MCU control module, the relay control module, and the load detection module. The MCU control module is electrically connected to the relay control module, the load detection module, and the LED indicator module. The power conversion module includes a first step-down module, an AC-DC power supply module, and a second step-down module. The load detection module includes a sampling resistor, an energy metering chip U1, and a resistor divider circuit. The sampling resistor is electrically connected to the energy metering chip, and the resistor divider circuit is electrically connected to the energy metering chip U1. The energy metering chip U1 is electrically connected to the MCU control module via a UART.

[0005] Furthermore, the relay control module includes a relay, a diode D2, and a switching circuit. The normally open terminal of the relay is electrically connected to a 220V AC mains power supply and a socket power supply, respectively. The coil terminal of the relay is electrically connected to the MCU control module and the switching circuit. The diode D2 is connected in parallel to the coil terminal of the relay.

[0006] Furthermore, the switching circuit includes a transistor Q9, a resistor R19, and a resistor R20. The collector of the transistor Q9 is connected to the coil terminal of the relay, the emitter of the transistor Q9 is grounded, the base of the transistor Q9 is connected to the first terminal of the resistor R19, the second terminal of the resistor R19 is connected to the sampling resistor RL1, the first terminal of the resistor R20 is connected to the emitter of the transistor Q8, and the second terminal of the resistor R20 is connected to the first terminal of the resistor R19.

[0007] Furthermore, the power metering chip U1 is a BL0939 metering chip. Pin 1 of the power metering chip U1 is connected to the first step-down module, pin 2 of the power metering chip U1 is connected to a protection circuit, and pins 14 and 15 of the power metering chip U1 are respectively connected to the MCU control module.

[0008] Furthermore, the output terminal of the resistor voltage divider circuit is connected to pin 7 of the power metering chip U1.

[0009] Furthermore, the MCU control module uses the N32G430K8L7 chip.

[0010] Furthermore, the MCU control module has a built-in timer.

[0011] Furthermore, the input terminals of the first step-down module and the AC-DC power supply module are respectively connected to a 220V AC mains power supply. The output terminal of the first step-down module is electrically connected to the load detection module, the output terminal of the AC-DC power supply module is electrically connected to the relay control module, the input terminal of the second step-down module is connected to the output terminal of the AC-DC power supply module, and the output terminal of the second step-down module is electrically connected to the MCU control module.

[0012] Furthermore, the first step-down module converts the MP150GJ 220V AC power supply to 3.3V DC voltage and supplies power to the energy metering chip U1. The AC-DC power supply module uses A-60GB-12 to convert the 220V AC power supply to 12V DC voltage and supplies power to the relay control module and RS485 communication module. The second step-down module uses LM117 to convert the 12V DC voltage to 3.3V DC voltage and supplies power to the MCU control module.

[0013] Furthermore, the input terminal of the LED indicator module is electrically connected to the output terminal of the MCU control module. Under the control of the MCU control module, the LED indicator module can light up, turn off, or flash, serving as an indicator of the charging status.

[0014] As can be seen from the above description of this utility model, compared with the prior art, the automatic load detection device for two-wheeled vehicle charging piles provided by this utility model has the following advantages: The MCU control module of this utility model is bidirectionally connected to the power metering chip U1 via UART, enabling the MCU control module to obtain the register data of the power metering chip U1. This data includes information related to power metering and load detection. Then, the sampling resistor RL and the resistor voltage divider circuit are used to transmit the mV-level signal and voltage drop information to the power metering chip U1, thereby accurately judging the state of the load, such as whether it is inserted and the power after insertion, achieving the effect of real-time monitoring of the physical connection of the charging port. At the same time, the LED indicator module can allow users to more intuitively understand the charging process and clearly display the different states of the charging head, further improving the user's charging experience and ease of use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the automatic load detection device for two-wheeled vehicle charging piles according to this utility model.

[0016] Figure 2 This is a circuit diagram of the MCU control module of this utility model;

[0017] Figure 3 This is the circuit diagram of the relay control module of this utility model;

[0018] Figure 4 This is a circuit diagram of the load detection module of this utility model;

[0019] Figure 5 This is the circuit diagram of the LED indicator module of this utility model. Detailed Implementation

[0020] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0021] like Figures 1 to 5As shown, an automatic load detection device for a two-wheeled vehicle charging station includes a power conversion module 1, an MCU control module 2, a relay control module 3, a load detection module 4, and an LED indicator module 5. The power conversion module 1 is electrically connected to the MCU control module 2, the relay control module 3, and the load detection module 4. The MCU control module 2 is electrically connected to the relay control module 3, the load detection module 4, and the LED indicator module 5. The power conversion module 1 includes a first step-down module, an AC-DC power supply module, and a second step-down module. The load detection module 4 includes a sampling resistor RL, an energy metering chip U1, and a resistor divider circuit. The sampling resistor is electrically connected to the energy metering chip, and the resistor divider circuit is electrically connected to the energy metering chip U1. The energy metering chip U1 is electrically connected to the MCU control module 2 via a UART. This invention can monitor the physical connection status of the charging port in real time, eliminating the need for users to select a charging port and providing a clear understanding of the charging process.

[0022] The relay control module 3 includes a relay, a diode D2, and a switching circuit. The normally open terminal of the relay is electrically connected to a 220V AC mains power supply and a socket power supply, respectively. The coil terminal of the relay is electrically connected to the MCU control module 2 and the switching circuit. The diode D2 is connected in parallel to the coil terminal of the relay. The switching circuit includes a transistor Q9, a resistor R19, and a resistor R20. The collector of the transistor Q9 is connected to the coil terminal of the relay, the emitter of the transistor Q9 is grounded, and the base of the transistor Q9 is connected to the first terminal of the resistor R19. The second terminal of the resistor R19 is connected to the third terminal of the resistor R20. The two ends of the resistor R20 are connected to the sampling resistor RL1. The first end of the resistor R20 is connected to the emitter of the transistor Q8, and the second end of the resistor R20 is connected to the first end of the resistor R19. This utility model connects two relay control modules 3. The normally open terminals 1 and 2 of the relay are connected to the 220V AC power supply and the socket power supply, respectively. The coil terminals 3 and 4 are connected to the 10 and 11 pins of the MCU control module 2, respectively. This allows the MCU control module 2 to send high and low level signals to the coil terminals of the relay to control the switching state of the relay, thereby realizing the on / off operation of the socket power supply.

[0023] The power metering chip U1 is a BL0939 metering chip. Pin 1 of the power metering chip U1 is connected to the first step-down module. Pin 2 of the power metering chip U1 is connected to a protection circuit. Pins 14 and 15 of the power metering chip U1 are respectively connected to the MCU control module 2. The output of the resistor divider circuit is connected to pin 7 of the power metering chip U1. Pins 14 and 15 of the MCU control module 2 are respectively connected to pins 15 and 14 of the power metering chip U1.

[0024] The working principle of load detection module 4 is as follows:

[0025] In the load detection module 4, a current sampling resistor RL is connected in series in the circuit. When a load is inserted, current flows through this sampling resistor, generating a voltage drop proportional to the current magnitude. Simultaneously, the voltage channel, through a series of precise resistor divider circuits, reduces the AC 220V voltage to a mV level signal according to a certain ratio. This mV level signal is transmitted to pin 7 of the energy metering chip U1. The energy metering chip U1, based on this signal and the voltage drop across the current sampling resistor RL, combined with its own algorithm and internal register settings, can accurately calculate the current in the circuit. The result is transmitted to the MCU control module 2 via the UART interface. The MCU control module 2 judges the received data; if it determines that the detection current of a certain socket is greater than the set value (3-15mA), it considers that a load has been inserted into that charging port, and thus automatically... The system automatically determines which charging port is in use, eliminating the need for manual selection by the user. During charging, the power metering chip U1 continuously monitors current and voltage data and calculates the charging power based on this data. Every certain time interval (e.g., every second), the metering chip transmits the calculated charging power, current, and other data to the MCU control module 2 via the UART interface. After receiving this data, the MCU control module 2 compares the current value with the set 50mA threshold. When the current value is less than 50mA, the MCU control module 2 sends a control signal to the relay control module 3. Upon receiving the signal, the relay control module 3 immediately cuts off the power to that charging port, stopping the charging process.

[0026] The MCU control module 2 uses an N32G430K8L7 chip. The MCU control module 2 has a built-in timer, which is a timing module based on the internal clock source of the MCU control module 2. It can accurately keep time according to a set time unit. During charging, the MCU control module 2 simultaneously monitors the timer's time and the charging status data transmitted by the power metering chip U1. At regular intervals, the power metering chip U1 transmits charging current, voltage, and other data to the MCU control module 2 via the UART interface. After receiving this data, the MCU control module 2 compares the current timer time with the set charging duration. When the timer reaches the set duration, the MCU control module 2 sends a control signal to the relay control module 3. Upon receiving the signal, the relay control module 3 immediately cuts off the power to the charging port, stopping charging.

[0027] The input terminals of the first step-down module and the AC-DC power supply module are respectively connected to a 220V AC power supply. The output terminal of the first step-down module is electrically connected to the load detection module 4, and the output terminal of the AC-DC power supply module is electrically connected to the relay control module 3. The input terminal of the second step-down module is connected to the output terminal of the AC-DC power supply, and the output terminal of the second step-down module is electrically connected to the MCU control module 2. The first step-down module converts the MP150GJ 220V AC power supply to 3.3V DC voltage and supplies power to the energy metering chip U1. The AC-DC power supply module uses an A-60GB-12 to convert the 220V AC power supply to 12V DC voltage and supplies power to the relay control module 3 and the RS485 communication module. The second step-down module uses an LM117 to convert the 12V DC voltage to 3.3V DC voltage and supplies power to the MCU control module 2.

[0028] The input terminal of the LED indicator module 5 is electrically connected to the output terminal of the MCU control module 2. Under the control of the MCU control module 2, the LED indicator module 5 can turn on, off, or flash, serving as an indicator of the charging status. The on / off state of the LED indicator module 5 is controlled by the MCU control module 2 according to the different working states of the charging port. The MCU control module 2 is connected to the control terminal of the LED indicator module 5 through its corresponding output pins, and controls the on / off and flashing frequency of the LED indicator module 5 by sending high and low level signals to the control terminal of the LED indicator module 5.

[0029] The working principle is as follows:

[0030] When the charging port is in standby mode, the MCU control module 2 detects that no load is inserted into the socket and no charging task is in progress. At this time, the MCU control module 2 sends a continuous high-level signal to the LED indicator module 5 through its output pin. After receiving the high-level signal, the green light of the LED indicator module 5 remains on, indicating that the charging port can be used normally but no load is connected.

[0031] When a load is inserted into the charging port, the load detection module 4 detects the insertion signal and transmits it to the MCU control module 2. After receiving the insertion signal, the MCU control module 2 sends a pulse signal of a specific frequency to the LED indicator module 5 through its output pin. After receiving the pulse signal, the LED indicator module 5 flashes a red light, indicating that a load has been inserted but charging has not yet started.

[0032] Once charging begins, the MCU control module 2 determines the charging status (such as whether there is charging current) and sends a continuous high-level signal to the indicator light through its output pin. After receiving the high-level signal, the LED indicator module 5 lights up red, indicating that charging is in progress.

[0033] When the battery is fully charged (in the fully charged automatic stop mode) or reaches the specified time (in the specified time mode), the MCU control module 2 detects that the charging task is complete. At this time, the MCU control module 2 will send a continuous high-level signal to the LED indicator module 5 through its output pin. After receiving the high-level signal, the green light will stay on, indicating that the charging is complete.

[0034] The above are only some specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. An automatic load detection device for a two-wheeled vehicle charging station, characterized in that: The system includes a power conversion module, an MCU control module, a relay control module, a load detection module, and an LED indicator module. The power conversion module is electrically connected to the MCU control module, the relay control module, and the load detection module. The MCU control module is electrically connected to the relay control module, the load detection module, and the LED indicator module. The power conversion module includes a first step-down module, an AC-DC power supply module, and a second step-down module. The load detection module includes a sampling resistor RL, an energy metering chip U1, and a resistor divider circuit. The sampling resistor is electrically connected to the energy metering chip, and the resistor divider circuit is electrically connected to the energy metering chip U1. The energy metering chip U1 is electrically connected to the MCU control module via a UART.

2. The automatic load detection device for a two-wheeled vehicle charging pile according to claim 1, characterized in that: The relay control module includes a relay, a diode D2, and a switching circuit. The normally open terminal of the relay is electrically connected to a 220V AC power supply and a socket power supply, respectively. The coil terminal of the relay is electrically connected to the MCU control module and the switching circuit. The diode D2 is connected in parallel to the coil terminal of the relay.

3. The automatic load detection device for a two-wheeled vehicle charging pile according to claim 2, characterized in that: The switching circuit includes a transistor Q9, a resistor R19, and a resistor R20. The collector of transistor Q9 is connected to the coil terminal of the relay, the emitter of transistor Q9 is grounded, the base of transistor Q9 is connected to the first terminal of resistor R19, the second terminal of resistor R19 is connected to the sampling resistor RL, the first terminal of resistor R20 is connected to the emitter of transistor Q8, and the second terminal of resistor R20 is connected to the first terminal of resistor R19.

4. The automatic load detection device for a two-wheeled vehicle charging pile according to claim 1, characterized in that: The power metering chip U1 is a BL0939 metering chip. Pin 1 of the power metering chip U1 is connected to the first step-down module. Pin 2 of the power metering chip U1 is connected to a protection circuit. Pins 14 and 15 of the power metering chip U1 are respectively connected to the MCU control module.

5. The automatic load detection device for a two-wheeled vehicle charging pile according to claim 1, characterized in that: The output of the resistor voltage divider circuit is connected to pin 7 of the power metering chip U1.

6. The automatic load detection device for a two-wheeled vehicle charging pile according to claim 1, characterized in that: The MCU control module uses the N32G430K8L7 chip.

7. An automatic load detection device for a two-wheeled vehicle charging pile according to claim 1 or 6, characterized in that: The MCU control module has a built-in timer.

8. The automatic load detection device for a two-wheeled vehicle charging pile according to claim 1, characterized in that: The input terminals of the first step-down module and the AC-DC power supply module are respectively connected to a 220V AC mains power supply. The output terminal of the first step-down module is electrically connected to the load detection module, the output terminal of the AC-DC power supply module is electrically connected to the relay control module, the input terminal of the second step-down module is connected to the output terminal of the AC-DC power supply module, and the output terminal of the second step-down module is electrically connected to the MCU control module.

9. The automatic load detection device for a two-wheeled vehicle charging pile according to claim 8, characterized in that: The first step-down module converts the MP150GJ 220V AC power supply to 3.3V DC voltage and supplies power to the energy metering chip U1. The AC-DC power supply module uses A-60GB-12 to convert the 220V AC power supply to 12V DC voltage and supplies power to the relay control module and RS485 communication module. The second step-down module uses LM117 to convert the 12V DC voltage to 3.3V DC voltage and supplies power to the MCU control module.

10. The automatic load detection device for a two-wheeled vehicle charging pile according to claim 1, characterized in that: The input terminal of the LED indicator module is electrically connected to the output terminal of the MCU control module. Under the control of the MCU control module, the LED indicator module can light up, turn off, or flash, serving as an indicator of the charging status.

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